Transformer



June 8,1926. 1,587,525

D. B. HILL TRANSFORMER Filed July 51, 1924 1*? Patented June 8, 1926.

UNITED STATES 1,587,525 PATENT OFFICE.

DWIGHT BRADFORD HILL, 0E WINCHESTER, MASSACHUSETTS, ASSIGNOR To SAID HILL AND HERBERT E. FRENCH, GOPARTNERS, As HILL RADIO 00., 0E BOSTON, MAss CHUSETTS.

Application filed July 31, 1924.

Objects of this invention are to hold a plurality of wound bodies together in a simple manner, to provide a rigid and selfsustaining structure, and to provide a small compact and inexpensive transformer in which the distributed capacity is reduced to a minimum.

In accordance with this invention a. transformer may be provided in which the primary coil is placed between the secondary coils. The coils may be constructed similarly in theform of a web in which insulated wire is woven from the center outwardly, the turns of individual wires being spaced both radially and axially from the turns of adjacent wires. Each wire preferably extends a substantial distance on one side of the coil before passing through to the other side, so that the exterior faces of the coils are substantially smooth and regular, and when finished the entire structure is relativeliy thin, rigid and self-sustaining. The secon ary and primary coils are preferably held in predetermined relation by lattice work which may consist of wires continued from one or both secondary coils cries-crossing the several coils, such for example as over the outer periphery of the transformer. The lattice work not only serves to hold the coils in predetermined relation to each other but, when the lattice work constitutes a part of the secondary coil or coils, it renders the magnetic linkage between the primary and secondary more effective.

A preferred embodiment of the invention is illustrated in the accompanying drawings in which,

Fig. 1 is a side view of a single coil;

Fig. 2 is a developed view of the coil showing the manner of winding;

Fig. 3 is a diagrammatic side View of the transformer;

Fig. A is a diagrammatic edge view of the transformer;

Fig. 5 is a developed view of the outer periphery of the transformer;

Fig. 6 is a developed view of the inner periphery of the transformer; and

Fig. 7 is an enlarged section on the line 77 of Fig. 1, the parts in back of the out being omitted for the sake of clearness.

In the embodiment of the invention illustrated, a transformer A comprises annular coils a, b, and c of insulated wire, the inter- TRANSFORMER.

Serial No. 728,307.

mediate coil b preferably constituting the primary coil and the coils a and c constituting the secondary coils. As hereinafter described the coils may be similarly constructed and are bound together at their eriph- 8I'lQS tO form a unitary structure w ich is relatively thin, compact, rigid and self-sustaming.

One way of making each coil is by winding nsulated wire in and out around a series of pins 1 which are placed radially at regular spaced mtervals. As indicated in Fig. 2 each wire'is wound over a plurality of pins (two in this instance) on one side, thence through to the other side of the coil and over the same number of pins and so on, until the coil is of proper size, the number of pins being indivisible by the number of pins forming a single winding step so that the wire crosses through different spaces between pins in each turn. A web construction 1s thereby produced in which the turns of the individual wires are spaced both axially and radially from the turns of adjacent wires and the exterior faces are substantially even and smooth.

A preferred way of making the transformer 1s to employ a form having three circular rows of radial pins spaced axially of the form. The central primary coil is first wound on the central row of pins as above described. One secondary coil is then wound on one of the end rows as above described and the wire extended over the primary coil to the other end row of pins, the second secondary coil being wound as a continuation of the first secondary coil. After the third coil is wound to the same diameter as the first two the criss-cross lattice work 1s Wound as a continuation of the second ary wire, The lattice work is wound in a manner slmilar to that of each coil except in that the wire crosses the entire width of the transformer back and forth between the two end rows of pins. Thus the primary comprises one wire having inncr and outer ends 3 and 4; and the two secondaries and lattice work comprises a second wire having inner and outer ends 5 and 6, 7 indicating the cross-over from the outer periphery of the first secondary to the inner periphery of the second secondary.

After the transformer is completely wound it is preferably dipped in a solution of cellulose acetate, or other substance adapted to render the structure self-sustaining when dried, whereupon it may be removed from the formand the pins withdrawn.

I claim:

1. A transformer comprising a primary coil, a secondary coil on each side of sald primary coil, and a Wire wound back and forth across the outer peripheries of said coils for holding the coils in predeteruuned relation.

2. A transformer comprising a primary coil, a secondary coil on. each side of sa d primary coil, means for spacing said coils from each other, and lattice work on the outer peripheries of said coils for holding them in predetermined relation.

3. A transformer comprising a primary coil, a secondary coil on each side of said primary coil, and wires CIISS-CIOSSOCl on the outer peripheries of said coils for holding them in predetermined relation.

4. A transformer comprismg a. primary coil, a secondary coil on each side of said primary coil and a wire continued from one of the secondary coils wound back and forth across the outer peri heries of said coils for holding them in pre etermined relation.

5. A transformer comprising a primary coil, a secondary coil on each side of the primary coil, and wire continuing from said secondary coils criss-crossed on the outer peripheries of said coils for holding them in predetermined relation.

6. A transformer comprising a primary coil, a secondary coil on each side of said primary coil, means for spacing said coils from each other, and lattice work on the outer peripheries of said coils formed by continuing a wire from at least one of said coils for holding them in predetermined relation.

7. A transformer comprising a primary coil, a secondary coil on each side of said primary coil, means for spacing said coils from each other, andlattice work on the outer peripherles of said coils comprlsing a continuation of the wires from said secondary coils for holding them in predetermined relation.

8. A transformer comprising a primary coil, a secondary coil on each side of said primary coil, said coils constructed of insulated wire woven from the center outwardly, the turns being spaced both axially and radially, and a wire wound back and forth on the outer peripheries of the coils for holding them in predetermined relation.

9. A transformer comprising a primary coil, a secondary coil on each side of said primary coil, said coils constructed. of in sulated wire woven from the center outwardly, the turns being spaced both axially 10. A transformer comprising a primary coil composed of concentric layers of insulated wire having a series of radial apertures, each wire passing more than one aperture before crossing to the opposite face, the total number of apertures being indivisable by the number of apertures forming a single winding step, secondary coils similarly constructed to said primary coil ou opposite sides thereof, and' insulated wires wound back and forth across the outer pcripheries of said coils for holding them in predetermined relation.

11. A transformer comprising a primary coil composed of concentric layers of insulated wire having a series of radial apertures, each wire passing more than one aperture before crossing to the other face, secondary coils. on opposite sides of said primary coils, and wires wound back and forth across the outer peripheries of said coils for holding them in predetermined relation.

12. A transformer comprising a rimary coil composed of concentric layers of insulated wire having a series of radial apertures, each wire passing more than one aperture before crossing to the other face, sec.- ondary coils similarly constructed to said primary coil on opposite sides thereof. and lattice work on the outer peripheries of said coils composed of wires continued from the secondary coils.

13. A transformer comprising a primary coil composed of concentric layers of insulated wire having a series of radial apertures, each wire passing more than one aperture before crossing to the other face, secondary coils similarly constructed to said primary coil on opposite sides thereof, and lattice work on the outer peripheries of said coils composed of Wires continued from the secondary coils.

14. An article as hereinbefore described comprising a plurality of relatively thin wound bodies, and lattice work on the outer edges of said bodies consisting of a continuation of the windings of at least one of said bodies for holding said bodies together.

15. An article as hereinbefore described comprising a plurality of relatively thin wound bodies, means for spacing said bodies from each other, and lattice work consisting of a continuation of the windings of at least one of said bodies for holding them in predetermined relation.

Signed by me at Providence, R. 1., this twenty-ninth day of July, 1924.

DWIGHT BRADFORD HILL. 

